Ccna routing and Switching Complete Study Guide

Configuring and Verifying EBGP

If you’re configuring BGP between a customer network and an ISP, this process is called 

external BGP (EBGP). If you’re configuring BGP peers between two routers in the same AS, 

it’s not considered EBGP.

You must have the basic information to configure EBGP:

 

■

AS numbers (your own, and all remote AS numbers, which must be different)

 

■

All the neighbors (peers) that are involved in BGP, and IP addressing that is used 

among the BGP neighbors

 

■

Networks that need to be advertised into BGP

For an example of configuring EBGP, here’s Figure 21.25.

f i g u r e   21. 2 5     Example of EBGP lay layout

AS=1

AS=100

AS=200